Re: PATCH: logical_work_mem and logical streaming of large in-progress transactions

Amit Kapila <amit.kapila16@gmail.com>

From: Amit Kapila <amit.kapila16@gmail.com>
To: Dilip Kumar <dilipbalaut@gmail.com>, Tomas Vondra <tomas.vondra@2ndquadrant.com>
Cc: Peter Eisentraut <peter.eisentraut@2ndquadrant.com>, PostgreSQL Hackers <pgsql-hackers@postgresql.org>
Date: 2019-11-13T12:25:04Z
Lists: pgsql-hackers

Commits

Same data as JSON: GET /api/v1/messages/:b64id/commits the thread's linked commits as JSON, with link sources. API reference →
  1. Tighten the concurrent abort check during decoding.

  2. Improve hash_create()'s API for some added robustness.

  3. Use HASH_BLOBS for xidhash.

  4. Fix initialization of RelationSyncEntry for streaming transactions.

  5. Remove unused function declaration in logicalproto.h.

  6. Add additional tests to test streaming of in-progress transactions.

  7. Fix inline marking introduced in commit 464824323e.

  8. Add support for streaming to built-in logical replication.

  9. Fix the SharedFileSetUnregister API.

  10. Fix comment in procarray.c

  11. Suppress compiler warning in non-cassert builds.

  12. Extend the BufFile interface.

  13. Mark a few logical decoding related variables with PGDLLIMPORT.

  14. Implement streaming mode in ReorderBuffer.

  15. Extend the logical decoding output plugin API with stream methods.

  16. WAL Log invalidations at command end with wal_level=logical.

  17. Immediately WAL-log subtransaction and top-level XID association.

  18. Allow logical replication to transfer data in binary format.

  19. Only superuser can set sslcert/sslkey in postgres_fdw user mappings

  20. Track statistics for spilling of changes from ReorderBuffer.

  21. Add logical_decoding_work_mem to limit ReorderBuffer memory usage.

  22. logical decoding: process ASSIGNMENT during snapshot build

  23. Emit invalidations to standby for transactions without xid.

On Thu, Oct 3, 2019 at 1:18 PM Dilip Kumar <dilipbalaut@gmail.com> wrote:
>

As mentioned by me a few days back that the first patch in this series
is ready to go [1] (I am hoping Tomas will pick it up), so I have
started the review of other patches

Review/Questions on 0002-Immediately-WAL-log-assignments.patch
-------------------------------------------------------------------------------------------------
1. This patch adds the top_xid in WAL whenever the first time WAL for
a subtransaction XID is written to correctly decode the changes of
in-progress transaction.  This patch also removes logging and applying
WAL for XLOG_XACT_ASSIGNMENT which might have some effect.  As replay
of that, it prunes KnownAssignedXids to prevent overflow of that
array.  See comments in procarray.c (KnownAssignedTransactionIds
sub-module).  Can you please explain how after removing the WAL for
XLOG_XACT_ASSIGNMENT, we will handle that or I am missing something
and there is no impact of same?

2.
+#define XLOG_INCLUDE_INVALS 0x08 /* include invalidations */

This doesn't seem to be used in this patch.

[1] - https://www.postgresql.org/message-id/CAA4eK1JM0%3DRwODZQrn8DTQ3dbcb9xwKDdHCmVOryAk_xoKf9Nw%40mail.gmail.com

-- 
With Regards,
Amit Kapila.
EnterpriseDB: http://www.enterprisedb.com